Introduction
Welcome to the Simhevn Electronic Digital Calipers instruction manual. This guide provides essential information for the safe and effective use of your new measuring tool. Please read this manual thoroughly before operation to ensure proper functionality and longevity of the device.
Product Features
- 4 Measuring Methods: Capable of measuring external diameter, internal diameter, depth, and step dimensions.
- Plastic Construction: The caliper's plastic pins prevent scratching of delicate objects and offer electrical insulation, enhancing safety.
- High Accuracy: Offers a resolution of 0.1 mm / 0.01 inch and an accuracy of ±0.2 mm / 0.01 inch for precise measurements.
- Unit Conversion: Easily switch between millimeter (mm) and inch (in) display modes with a dedicated button.
- Large LCD Display: Provides clear, instant digital readings for convenient data acquisition.
- Automatic On/Off: The caliper automatically powers on when the slider is moved and shuts off after approximately 5 minutes of inactivity to conserve battery life.
- Zero Calibration: Allows for resetting the display to zero at any position, enabling differential measurements.
- Power Supply: Operates on one LR44/AG13 1.5V battery. One battery is pre-installed, and two spare batteries are included.

Figure 1: Overview of Simhevn Digital Caliper features.
Setup
- Unpacking: Carefully remove the digital caliper from its packaging. Inspect for any visible damage.
- Battery Installation:
- Locate the battery compartment on the back of the LCD display unit.
- Slide open the battery cover.
- If present, remove the plastic insulation tab from the pre-installed battery.
- Insert one LR44/AG13 1.5V battery with the positive (+) side facing up.
- Close the battery cover securely.
Note: Two spare batteries are included for future replacement.

Figure 2: Key components of the Simhevn Digital Caliper.
Operating Instructions
- Power On/Off:
- The caliper automatically turns on when the slider is moved.
- To manually turn off, press the red "OFF" button.
- The caliper will automatically shut off after approximately 5 minutes of inactivity to conserve battery life.
- Unit Conversion:
- Press the blue "mm/inch" button to switch the display between millimeter (mm) and inch (in) units.

Figure 3: Unit conversion display on the LCD screen.
- Zero Calibration:
- Ensure the measuring jaws are completely closed and clean.
- Press the yellow "ZERO" button. The display should show "0.00" (for inches) or "0.0" (for millimeters).
- This function allows for setting a new zero point at any position, useful for differential measurements.
- Measurement Methods:
- External Measurement: Use the long jaws to measure the outer dimensions of objects.
- Internal Measurement: Use the top jaws to measure the inner dimensions of objects.
- Depth Measurement: Extend the depth rod (located at the end of the sliding jaw) into a hole or recess to measure its depth.
- Step Measurement: Use the step measuring face (located at the end of the fixed jaw) to measure step dimensions between two surfaces.

Figure 4: Demonstrating the four measurement methods.
Product Demonstration Video
Video 1: A demonstration of the Simhevn Digital Caliper, showcasing its accuracy and elegant design. This video provides a visual guide to the product's functionality and precision.
Maintenance
- Cleaning: Wipe the caliper with a clean, dry, soft cloth after each use. Do not use solvents, harsh chemicals, or immerse the device in water, as this can damage the electronic components.
- Storage: Store the caliper in its protective case when not in use. Keep it in a dry, clean environment, away from direct sunlight, dust, and extreme temperatures.
- Battery Replacement: When the LCD display becomes dim, flickers, or shows inconsistent readings, it is time to replace the battery. Follow the battery installation steps outlined in the Setup section.
Troubleshooting
- Inaccurate Readings:
- Ensure the measuring jaws are clean and free of any debris or dust particles.
- Perform a zero calibration by closing the jaws completely and pressing the "ZERO" button.
- Check the battery level; replace if the battery is low.
- Display Not Working:
- Verify that the battery is correctly installed and oriented.
- Replace the battery with a fresh LR44/AG13 1.5V battery.
Specifications
| Attribute | Value |
|---|---|
| Brand | Simhevn |
| Model | NEW 150mm Black plastic |
| Measuring Range | 0-150 mm / 0-6 inch |
| Resolution | 0.1 mm / 0.01 inch |
| Accuracy | ±0.2 mm / 0.01 inch |
| Material | Plastic |
| Power | 1 x LR44/AG13 1.5V Battery |
| Product Dimensions | 9.3"L x 3"W |
Warranty Information
This Simhevn product is covered by a standard manufacturer's warranty. For detailed information regarding warranty terms, duration, and coverage, please refer to the warranty card included with your product or contact Simhevn customer support directly.
Support
Should you require further assistance, technical support, or have any questions regarding your Simhevn Electronic Digital Calipers, please contact our customer service team. Contact information can typically be found on the product packaging or through the retailer's platform where the product was purchased.